X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=probes%2Flttng-probe-user.c;h=57dd33e198a780bc341659d175cce016b2d00da8;hb=a1ffd991c43db2a7c031ca1c5c50681a6cebdd84;hp=0d1f95fe00861aec694136b514e07523e285898d;hpb=01a12501e0b0395b60c7e392cb7dded51ae572ca;p=lttng-modules.git

diff --git a/probes/lttng-probe-user.c b/probes/lttng-probe-user.c
index 0d1f95fe..57dd33e1 100644
--- a/probes/lttng-probe-user.c
+++ b/probes/lttng-probe-user.c
@@ -10,6 +10,8 @@
 #include <wrapper/uaccess.h>
 #include <probes/lttng-probe-user.h>
 
+#define LTTNG_MAX_USER_STRING_LEN 1048576 /* 1MB */
+
 /*
  * Calculate string length. Include final null terminating character if there is
  * one, or ends at first fault. Disabling page faults ensures that we can safely
@@ -41,6 +43,8 @@ long lttng_strlen_user_inatomic(const char *addr)
 		if (unlikely(ret > 0))
 			break;
 		count++;
+		if (unlikely(count > LTTNG_MAX_USER_STRING_LEN))
+			break;
 		if (unlikely(!v))
 			break;
 		addr++;